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Defining Hydrogen-induced Cracking Test Criteria for Commodity-grade Line Pipe in Less Severe Sour Conditions
This technical report (TR) supports the development of a moderate sour service commodity grade under API Specification 5L:2018 Annex H, while maintaining harmonization with ISO 15156 and NACE TM0284:2016 as regards resistance testing to hydrogen-induced cracking (HIC). To define the HIC test conditions and exposure duration needed for that purpose, the impact of varying test durations on the extent of cracking in less severe sour test environments was specifically assessed in solutions containing 1−10 % H2S within pH values 3.5−4.5. For the series of HIC tests conducted, sweet service test material from two different pipes was used, which showed different susceptibility to cracking in moderate sour conditions.
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